"Oh. My. God!" exclaims a Sherlock fan after her phone buzzes to life.

Various Twitter hashtags take over the screen: #SherlockIsAlive!, #SherlockIsNotDead and #SherlockLives are among the most popular ones. (Talk about being meta.)

In August, the first trailer touting the return of the British series -- which plays on PBS Masterpiece in the U.S. -- debuted, focusing on various characters' reactions to learning of Sherlock's faked death. This one goes a step further, opening with John Watson (Martin Freeman) visiting Sherlock's grave and later likely coming face-to-face with the news.